CVE-2025-21854
published 2025-03-12CVE-2025-21854: In the Linux kernel, the following vulnerability has been resolved: sockmap, vsock: For connectible sockets allow only connected sockmap expects all vsocks to…
PriorityP419medium5.5CVSS 3.1
AVLACLPRLUINSUCNINAH
EPSS
0.20%
9.6th percentile
In the Linux kernel, the following vulnerability has been resolved:
sockmap, vsock: For connectible sockets allow only connected
sockmap expects all vsocks to have a transport assigned, which is expressed
in vsock_proto::psock_update_sk_prot(). However, there is an edge case
where an unconnected (connectible) socket may lose its previously assigned
transport. This is handled with a NULL check in the vsock/BPF recv path.
Another design detail is that listening vsocks are not supposed to have any
transport assigned at all. Which implies they are not supported by the
sockmap. But this is complicated by the fact that a socket, before
switching to TCP_LISTEN, may have had some transport assigned during a
failed connect() attempt. Hence, we may end up with a listening vsock in a
sockmap, which blows up quickly:
KASAN: null-ptr-deref in range [0x0000000000000120-0x0000000000000127]
CPU: 7 UID: 0 PID: 56 Comm: kworker/7:0 Not tainted 6.14.0-rc1+
Workqueue: vsock-loopback vsock_loopback_work
RIP: 0010:vsock_read_skb+0x4b/0x90
Call Trace:
sk_psock_verdict_data_ready+0xa4/0x2e0
virtio_transport_recv_pkt+0x1ca8/0x2acc
vsock_loopback_work+0x27d/0x3f0
process_one_work+0x846/0x1420
worker_thread+0x5b3/0xf80
kthread+0x35a/0x700
ret_from_fork+0x2d/0x70
ret_from_fork_asm+0x1a/0x30
For connectible sockets, instead of relying solely on the state of
vsk->transport, tell sockmap to only allow those representing established
connections. This aligns with the behaviour for AF_INET and AF_UNIX.
Affected
15 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| debian | linux | < linux 6.12.17-1 (forky) | linux 6.12.17-1 (forky) |
| linux | linux | — | — |
| linux | linux | >= 634f1a7110b439c65fd8a809171c1d2d28bcea6f < cc9a7832ede53ade1ba9991f0e27314caa4029d8 | cc9a7832ede53ade1ba9991f0e27314caa4029d8 |
| linux | linux | >= 634f1a7110b439c65fd8a809171c1d2d28bcea6f < 22b683217ad2112791a708693cb236507abd637a | 22b683217ad2112791a708693cb236507abd637a |
| linux | linux | >= 634f1a7110b439c65fd8a809171c1d2d28bcea6f < f7b473e35986835cc2813fef7b9d40336a09247e | f7b473e35986835cc2813fef7b9d40336a09247e |
| linux | linux | >= 634f1a7110b439c65fd8a809171c1d2d28bcea6f < 8fb5bb169d17cdd12c2dcc2e96830ed487d77a0f | 8fb5bb169d17cdd12c2dcc2e96830ed487d77a0f |
| linux | linux_kernel | — | — |
| linux | linux_kernel | >= 0 < 6.12.17-1 | 6.12.17-1 |
| linux | linux_kernel | >= 0 < 6.12.17-1 | 6.12.17-1 |
| linux | linux_kernel | >= 0 < 6.8.0-78.78 | 6.8.0-78.78 |
| linux | linux_kernel | >= 6.13 < 6.13.5 | 6.13.5 |
| linux | linux_kernel | >= 6.4 < 6.6.80 | 6.6.80 |
| linux | linux_kernel | >= 6.7 < 6.12.17 | 6.12.17 |
| msrc | azl3_kernel_6.6.78.1-3_on_azure_linux_3.0 | — | — |
| msrc | azl3_kernel_6.6.82.1-1_on_azure_linux_3.0 | — | — |
CVSS provenance
nvdv3.15.5MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
osv5.5MEDIUM
vendor_debian5.5LOW
vendor_msrc5.5MEDIUM
vendor_redhat5.5MEDIUM
vendor_ubuntu5.5MEDIUM
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CVE-2025-21854: In the Linux kernel, the following vulnerability has been resolved: sockmap, vsock: For connectible sockets allow only connected sockmap expects all v
osv·2025-03-12·CVSS 5.5
CVE-2025-21854 [MEDIUM] CVE-2025-21854: In the Linux kernel, the following vulnerability has been resolved: sockmap, vsock: For connectible sockets allow only connected sockmap expects all v
In the Linux kernel, the following vulnerability has been resolved: sockmap, vsock: For connectible sockets allow only connected sockmap expects all vsocks to have a transport assigned, which is expressed in vsock_proto::psock_update_sk_prot(). However, there is an edge case where an unconnected (connectible) socket may lose its previously assigned transport. This is handled with a NULL check in the vsock/BPF recv path. Another design detail is that listening vsocks are not supposed to have any transport assigned at all. Which implies they are not supported by the sockmap. But this is complicated by the fact that a socket, before switching to TCP_LISTEN, may have had some transport assigned during a failed connect() attempt. Hence, we may end up with a listening vsock in a sockmap, which b
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GHSA-vwm2-mqfj-r5v5: In the Linux kernel, the following vulnerability has been resolved:
sockmap, vsock: For connectible sockets allow only connected
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ghsa_unreviewed·2025-03-12
CVE-2025-21854 [MEDIUM] CWE-476 GHSA-vwm2-mqfj-r5v5: In the Linux kernel, the following vulnerability has been resolved:
sockmap, vsock: For connectible sockets allow only connected
sockmap expects all
In the Linux kernel, the following vulnerability has been resolved:
sockmap, vsock: For connectible sockets allow only connected
sockmap expects all vsocks to have a transport assigned, which is expressed
in vsock_proto::psock_update_sk_prot(). However, there is an edge case
where an unconnected (connectible) socket may lose its previously assigned
transport. This is handled with a NULL check in the vsock/BPF recv path.
Another design detail is that listening vsocks are not supposed to have any
transport assigned at all. Which implies they are not supported by the
sockmap. But this is complicated by the fact that a socket, before
switching to TCP_LISTEN, may have had some transport assigned during a
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- Character device driver;
- TPM device driver;
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- GPIO subsystem;
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- Bluetooth drivers;
- Character device driver;
- TPM device driver;
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- Serial ATA and Parallel ATA drivers;
- Drivers core;
- Network block device driver;
- Bluetooth drivers;
- Character device driver;
- TPM device driver;
- Clock framework and drivers;
- Hardware crypto device drivers;
- FireWire subsystem;
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An attacker could possibly use these to compromise the system.
This update corrects flaws in the following subsystems:
- ARM64 architecture;
- PowerPC architecture;
- x86 architecture;
- Block layer subsystem;
- Serial ATA and Parallel ATA drivers;
- Drivers core;
- Network block device driver;
- Bluetooth drivers;
- Character device driver;
- TPM device driver;
- Clock framework and drivers;
- Hardware crypto device drivers;
- FireWire subsystem;
- EFI core;
- Qualcomm firmware drivers;
- GPIO subsystem;
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Red Hat
kernel: sockmap, vsock: For connectible sockets allow only connected
vendor_redhat·2025-03-12·CVSS 5.5
CVE-2025-21854 [MEDIUM] CWE-476 kernel: sockmap, vsock: For connectible sockets allow only connected
kernel: sockmap, vsock: For connectible sockets allow only connected
In the Linux kernel, the following vulnerability has been resolved:
sockmap, vsock: For connectible sockets allow only connected
sockmap expects all vsocks to have a transport assigned, which is expressed
in vsock_proto::psock_update_sk_prot(). However, there is an edge case
where an unconnected (connectible) socket may lose its previously assigned
transport. This is handled with a NULL check in the vsock/BPF recv path.
Another design detail is that listening vsocks are not supposed to have any
transport assigned at all. Which implies they are not supported by the
sockmap. But this is complicated by the fact that a socket, before
switching to TCP_LISTEN, may have had some transport assigned during a
failed connect() atte
Microsoft
sockmap, vsock: For connectible sockets allow only connected
vendor_msrc·2025-03-11·CVSS 5.5
CVE-2025-21854 [MEDIUM] CWE-476 sockmap, vsock: For connectible sockets allow only connected
sockmap, vsock: For connectible sockets allow only connected
FAQ: Is Azure Linux the only Microsoft product that includes this open-source library and is therefore potentially affected by this vulnerability?
One of the main benefits to our customers who choose to use the Azure Linux distro is the commitment to keep it up to date with the most recent and most secure versions of the open source libraries with which the distro is composed. Microsoft is committed to transparency in this work which is why we began publishing CSAF/VEX in October 2025. See this blog post for more information. If impact to additional products is identified, we will update the CVE to reflect this.
Mariner: Mariner
Linux: Linux
Customer Action Required: Yes
Remediation: CBL-Mariner Releases
Reference: https://
Debian
CVE-2025-21854: linux - In the Linux kernel, the following vulnerability has been resolved: sockmap, vs...
vendor_debian·2025·CVSS 5.5
CVE-2025-21854 [MEDIUM] CVE-2025-21854: linux - In the Linux kernel, the following vulnerability has been resolved: sockmap, vs...
In the Linux kernel, the following vulnerability has been resolved: sockmap, vsock: For connectible sockets allow only connected sockmap expects all vsocks to have a transport assigned, which is expressed in vsock_proto::psock_update_sk_prot(). However, there is an edge case where an unconnected (connectible) socket may lose its previously assigned transport. This is handled with a NULL check in the vsock/BPF recv path. Another design detail is that listening vsocks are not supposed to have any transport assigned at all. Which implies they are not supported by the sockmap. But this is complicated by the fact that a socket, before switching to TCP_LISTEN, may have had some transport assigned during a failed connect() attempt. Hence, we may end up with a listening vsock in a sockmap, which b
No detection rules found.
No public exploits indexed.
2025-03-12
Published